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Ford Circles with Variable Radii

iterations
3
zoom
9.9
left circle radius
3
right circle radius
3
center point
3
Ford circles are centered at
h
k
,
1
2
2
k
, with radii
1
2
2
k
, where
h
and
k
are coprime integers. Each circle is tangent to the
x
axis at
h
k
and to two circles from earlier iterations. This Demonstration shows the Ford circles with the extra feature that the radii of the two largest circles are variable. Thus, in each direction, the scaling of the circle of the next level is different. Iteration
n
generates
n
2
+1
circles. In the limit
n
, each circle becomes tangent to infinitely many other circles.
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